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PM2.5 Pollution in India from 1998 - 2014

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February 8, 2017

Critical Commentary

Image found here: http://www.urbanemissions.info/india-satpm25/
Urban Emissions is a private company that collects and analyzes air quality data. The data for India was extracted from a global database distributed by Dalhousie University, Canada. “We estimate ground-level fine particulate matter (PM2.5) by combining Aerosol Optical Depth (AOD) retrievals from the NASA MODIS, MISR, and SeaWIFS instruments with the GEOS-Chem chemical transport model, and subsequently calibrated to global ground-based observations of PM2.5 using Geographically Weighted Regression (GWR) as detailed in the below reference.” The data is publicly available and downloadable in several different formats. This data is only levels of PM2.5, not PM10, so the numbers seem lower than other maps that use AQI values for their data.